Fatal error: Uncaught Error: Class 'JMS\Serializer\Handler\HandlerRegistry' not found in /home/itscm/dev.its.cm/itsrestapi/vendor/jms/serializer/src/Handler/LazyHandlerRegistry.php:11 Stack trace: #0 {main} thrown in /home/itscm/dev.its.cm/itsrestapi/vendor/jms/serializer/src/Handler/LazyHandlerRegistry.php on line 11